Stop IRC by hand; remove mDNS

IrcService::disconnect() stops the session from any state: QUIT if
connected, then no more retries. /quit goes through it (before, it only
stopped a connected session; while waiting for Wi-Fi or retrying it did
nothing), and so does the new `irc stop` command. Stopped by hand,
opening the IRC App no longer reconnects; typing a line does.

mDNS is gone: it never crossed the dev box's routed network, and it
cost about 7.5 KB of RAM. Pushes go to the IP shown in Settings ->
Firmware, which drops its Name row. OTA Q54 records the change.

On the device, Debug Build: 105.6 KB free with Wi-Fi (was 98); with IRC
on TLS 54 KB free (was 46); after `irc stop`, back to 99 KB.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

src/apps/firmware_page.cpp

@@ -78,7 +78,6 @@ void FirmwarePage::draw(Canvas& c) {
                 case kVersion: return "Version";
                 case kStatus: return "Status";
                 case kAddress: return "Push to";
-                case kName: return "Name";
                 case kSdHeader: return listed ? (found.empty() ? "No .ota files in /updates" : "On the SD card:") : "Looking on the SD card...";
                 default: return "  " + found[i - kFixed].substr(std::string(kUpdatesFolder).size() + 1);
             }
@@ -88,7 +87,6 @@ void FirmwarePage::draw(Canvas& c) {
                 case kVersion: return versionString();
                 case kStatus: return update_.onProbation() ? "on probation" : "confirmed";
                 case kAddress: return ip.empty() ? "Wi-Fi not connected" : ip + ":" + std::to_string(UpdateService::kPort);
-                case kName: return update_.hostname() + ".local";
                 case kSdHeader: return "";
                 default: return "install >";
             }

src/apps/firmware_page.h

@@ -28,7 +28,7 @@ class FirmwarePage {
     void draw(Canvas& c);
 
    private:
-    enum Row { kVersion, kStatus, kAddress, kName, kSdHeader, kFixed };
+    enum Row { kVersion, kStatus, kAddress, kSdHeader, kFixed };
 
     std::vector<std::string> files();
 

src/apps/irc_app.cpp

@@ -42,7 +42,7 @@ std::string lowered(std::string s) {
 void IrcApp::onEnter() {
     page_ = Page::Chat;
     editing_ = false;
-    irc_.connect();
+    if (!irc_.stoppedByUser()) irc_.connect();  // stopped by hand: stay stopped, typing reconnects
     view(current_);
 }